Fluid-fuel furnace



S. R. HARDWICK.

FLUID FUEL FURNACE. APPLICATION FILED dcnzs. l9l8.

Patented Dec. 28, 1920.

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attozncg S. R. HARDWiCK.

FLUID FUEL FURNACE.

APPLICATION men ocnzs. 1918.

1 ,363,867. Patented "Dec. 28, 1920.

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UNITED STATES PATENT OFFICE.

STANLEY R. HARDWICK, OF TOLEDO, OHIO, ASSIGNOR OF ONE-HALF TO JAMES A. WOOD, OF TOLEDO, OHIO.

FLUID-FUEL FURNACE.

Application filed October 25, 1918.

T 0 all whom it may concern:

Be it known that I, STANLEY R. HARD- WIGK, a citizen of the United States of America, residing at Toledo, Lucas county, Ohio, have invented new and useful Fluid- Fuel Furnaces, of which the following is a specification.

This invention relates to heating equipment, especially for quiet complete combustion of fluid fuels.

This invention has utility in connection with controllable fuel and air supplies to a carbureter and burner house heating furnace installation, especially of the hot air type.- 7

Referring to the drawings:

Figure 1 is a side elevation, with parts broken away, of an embodiment of the invention for residence heating hot air furnaces;

Flzig. 2 is a plan of the firepot of the furnace of ig. 1;

Fig. 3 is a fragmentary view, on an enlarged scale, of the mixer portion of this burner installation;

Fig. 4 is a still further enlarged detail, in section, of the fuel supply duct at the mixer mounting thereon;

Fig. 5 is a section through the carbureter; and

Fig. 6 is a side elevation, with parts broken away, of the reservoir for the liquid fuel, and its air supply.

The hot air furnace 1 may be provided with a fire pot 2 having a grate 3, which is sealed against cold air flow upward therethrough to interfere with fire pot combustion, by fire brick floor 4:. The fire hole 5 may be filled with fire brick laid in fire-clay to form a seal 6, while in the firepot 2, there may be fire brick providing branching way 7 with a grid 8 of fire brick thereover, as a heat retaining mass in the furnace, to stabilize the radiation rate of the furnace.

An electric motor 9 may serve by a belt 10 to operate a rotary air pump 11 having the air intake 12 and air outlet 13. This pump 11 may in a simple form comprise an eccentrically disposed hub 14 carrying grooved lugs 15 in which rounded bearing ends of centrifugal wings 16 may be shoved axially into assembled relation when the head of the pump is removed. From the Specification of Letters Patent.

Patented Dec. 28, 1920.

Serial No. 259,613.

pump outlet 13 extends duct 17 to the top of air tight reservoir or tank 18. This tank 18 may be of a desired capacity according to the extent and continuity of desired operation. If only for emergency use in ordinary eight or nine room houses in this latitude eight or ten gallons in size may be sufficient, and it may be filled even to three fourths full. Extending down into such liquid fuel, which may be not only gasolene, but even kerosene or crude oil, may be a small liquid fuel supply duct 19, the flow or rather opening through which may be controlled by a valve 20. Air line 21 from the reservoir 18 above the liquid fuel level, has a branch 22 with a valve 23 to a line 24; into which the line 19 leads, so the control of the valves 20, 23, may regulate inspirator action together with partial aeration of liquid fuel in the line 24 leading to the jet or spraying nozzle 25 in screw head 26 mounted on cylindrical carbureter chamber 27.

With this liquid fuel controllable supply, house heating may be maintained, as during a drop in pressure, or entire failure of normal gas supply by line 28 past valve 29 through the head 26. When there is sufficient gas supply, carburation thereof maybe unnecessary, and the valve 30 may shut off gas supply to the carbureter heating jet or burner 31. In the operation of the burner 31, its combustion gases are confined by housing 32 and taken by duct 33 into the furnace 1. For this gas circulation, openings 34 are provided in the lower portion of the housing 32.

The upstanding end 35 of the supply line to the carbureter heating burner precludes flooding of this heating jet, while upstanding portion 36 of delivery duct 37 through carbureter chamber head 38 also minimizes condensation flow therein. The carbureter assembly being of tapped and threaded elements, there is permitted ready assembly, as well as ready knocking down for inspection or cleaning, should slight carbonizing occur in extended low grade fuel operation.

The fuel supply or rather delivery duct from the carbureter may desirably extend to a valve 39 communicating with a duct 40 having a tapered forward discharge end 41 (Fig. 4) having a central opening 42 and lateral openings 43. These latter openings 43 may be closed by seating against the tapered portion 4a of sleeve 45, thus confining fuel flow to the opening 1-2. The fuel flow may be augmented by shifting of the sleeve 45 to permit flow from the openings T3.

In the liquid fuel operation, some air is supplied through the duct or line 24f from the lines 22, 21, and usual mixer air may enter the flare portion 46 about the duct 40, as regulated by the disk 47 threaded. thereon for shifting as desired. The quiet and complete roarless burning is completely accomplished in combustion gas flow way 48 to which the mixer 46 and the duct -10 deliver the fuel, by the supplemental air line 49, the air flow in which may be regulated by valve 50.

This supplemental air from the line 49, is advantageously used in this installation with fuel from, the line 28, as well as from the line 19. The regulation of the inspirator air by the 'valve 23 is effective for the use of the common delivery duct 40. Upon the inadequacy of the normal gas line being evidenced, the valves 20, 23, may be manipulated, and the liquid fuel supply even made the sole supply by closing the valve 29. In any operation with the liquid fuel, it is desir-able to heat the carbureter chamber by opening the valve 30 and lighting the jet 31. Vhile effective as a unit for heating, the'combined installation as an emergency safeguard gives it exceptional value in regions depending upon gas supply where sudden extremes of cold weather overtax such supply. Change over can be made without interruption of service. The spent gas from the carbureter assists in furnace heating. Adjusting of the refractory sleeve 48 as to the flare 46 may regulate this fur ther air supply.

What is claimed and it is desired to secure by Letters Patent is:

1. A burner comprising a mixer, a housing providing a combustion gas flow way from the mixer, said mixer having independently adjustable fuel and air supply means, the air supply through said air supply means being at atmospheric pressure, and a supplemental pressure air supply beyond the mixer in said way.

2. A fluid fuel supply, air feeding means therefor, a control for the feeding means, a carbureter to which the means delivers, a burner connected to the carbureter, means between the carbureter and burner for regulating the flow from the carbureter to the burner, and an air supply into the burner between the regulating means and burner.

3. A carbureter chamber, means for spraying a fuel thereinto, a burner for heating the carbureter chamber, a housing for the chamber, and an adjustable burner spaced from the chamber, connected thereto to be supplied with fuel therefrom, and an air supply for the adjustable burner, said adjustable burner having the adjustment regulate air and fuel supply thereto.

l. A burner comprising a funnel-shaped mixer, a spider inwardly extending across the flare funnel portion of the mixer and carrying integral with the mixer a central sleeve with an inner wall narrowing toward the narrower portion of the mixer funnel, and a fuel supply duct for the mixer mounted in the sleeve, said duct being terminally tapered and provided with terminal and lateral openings, whereby shifting the duct back from the narrowing portion of the sleeve may effect increase of fuel supply to the mixer from the duct lateral openings.

In witness whereof I affix my signature.

STANLEY R. HARDIVIOK. 

